Eddy mass transport for the Southern Ocean in an eddy-permitting global ocean model
Eddy mass transport for the Southern Ocean in an eddy-permitting global ocean model
复制标题
允许涡流的全球海洋模型中南大洋的涡流质量传输
DOI：
10.1016/s1463-5003(02)00044-6
复制
发表时间：
2003
期刊：
影响因子：
3.2
通讯作者：
A. Coward
中科院分区：
文献类型：
--
作者：
Mei;A. Coward
在允许涡旋的全球海洋模式（OCCAM）中，对南大洋的涡旋诱导质量输运进行了诊断。重点是深海中瞬变涡流的运输。在四种不同的坐标系组合下计算输运流函数。根据所采用的坐标系不同，瞬态涡旋输运强度从纬密度坐标下的6 Sv经向输运到流线深度坐标下的20 Sv跨流线输运不等。结果表明，瞬态涡旋和静止涡旋都是消除迪肯细胞的必要条件。在南极底水密度层，瞬态涡旋对净向赤道输送的主要贡献是：(a)在狭窄的德雷克海峡上空的强输送，以及(b)在东南太平洋更广阔的区域内较弱但系统的输送，在那里南极绕极流分裂成多个喷流。相反，在北大西洋深水密度层，净向极涡旋输送几乎无处不在。这表明对涡旋的关注不应局限于涡旋输送强度大的地方。
The eddy-induced mass transport is diagnosed for the Southern Ocean in an eddy-permitting global ocean model (OCCAM). The focus is on the transport by transient eddies in the deep ocean. The transport streamfunction is calculated in four different combinations of coordinate system. Depending on the coordinate system employed, the strength of transient eddy transport varies from 6 Sv meridional transport in latitude-density coordinates to 20 Sv across-streamline transport in streamline-depth coordinates. It is shown that transient eddies as well as standing eddies are necessary for cancelling the Deacon cell. In the Antarctic bottom water density layer, the major contribution of the transient eddies towards net equatorward transport occurs (a) as a strong transport over the narrow Drake Passage and (b) as a weaker but systematic transport over a broader region in the southeast Pacific where the Antarctic circumpolar current breaks up into multiple jets. In contrast, in the North Atlantic deep water density layer the net poleward eddy transport is spread out almost everywhere. This suggests that attention to eddies should not be restricted to places where the eddy transport has large magnitude.